Updates tests of getters in test_schema.py

tests/unit/test_schema.py

@@ -1197,7 +1197,7 @@ def _make_one(self, *args, **kw):
     def test_ctor_valid_input(self, type_system, expected):
         result = self._make_one(type_system=type_system)
 
-        assert result._properties["typeSystem"] == expected
+        assert result.type_system == expected
 
     def test_ctor_invalid_input(self):
         with pytest.raises(TypeError) as e:
@@ -1293,15 +1293,15 @@ def test_ctor_valid_input(
             output_format=output_format,
             serde_info=serde_info,
         )
-        assert storage_descriptor._properties["inputFormat"] == input_format
-        assert storage_descriptor._properties["locationUri"] == location_uri
-        assert storage_descriptor._properties["outputFormat"] == output_format
+        assert storage_descriptor.input_format == input_format
+        assert storage_descriptor.location_uri == location_uri
+        assert storage_descriptor.output_format == output_format
         if serde_info is not None:
             assert (
-                storage_descriptor._properties["serDeInfo"] == serde_info.to_api_repr()
+                storage_descriptor.serde_info == serde_info.to_api_repr()
             )
         else:
-            assert storage_descriptor._properties["serDeInfo"] == serde_info
+            assert storage_descriptor.serde_info == serde_info
 
     @pytest.mark.parametrize(
         "input_format,location_uri,output_format,serde_info",
@@ -1397,9 +1397,9 @@ def test_ctor_valid_input(self, serialization_library, name, parameters):
             name=name,
             parameters=parameters,
         )
-        assert serde_info._properties["serializationLibrary"] == serialization_library
-        assert serde_info._properties["name"] == name
-        assert serde_info._properties["parameters"] == parameters
+        assert serde_info.serialization_library == serialization_library
+        assert serde_info.name == name
+        assert serde_info.parameters == parameters
 
     @pytest.mark.parametrize(
         "serialization_library,name,parameters",